White's plan is to play f3-e4.
13... b8d7 Ding finds a strong novelty, although it took him a long time on the clock. 14. f3d2 The bishop is stuck on c2, but Ding had foreseen this. 14... h8g8 The only way to justify 13...Nbd7. Black is right in time to save the bishop. The idea is to play …g6-g5 and bring it back. 15. g4g5 This grants the bishop the f5-square. 15... f6h5 